<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>框架中显示网页</title>
</head>
<frameset rows="80, *">
    <frame src="EX2_5_top.html" name="frmtop">
    <frameset cols="25%,*">
        <frame src="EX2_5_left.html" name="frmleft"/>
        <frame src="EX2_5_content.html" name="frmmain"/>
    </frameset>
</frameset>
</html>